Dual sparked with a decomp slot...but filled with a 3rd spark? I wouldn't think that's too uncommon?
I know a lot of bultacos were dual sparked and a lot of people drilled/tapped the heads for a decomp piston.

Dual sparked with a decomp slot...but filled with a 3rd spark? I wouldn't think that's too uncommon?
I know a lot of bultacos were dual sparked and a lot of people drilled/tapped the heads for a decomp piston.

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yep, there were some dual plugged heads, but i would think throwing another hole in there for a decomp makes that combustion chamber pretty messy and weak.